import React, { Component } from 'react'
// 引入store， 用于获取redux中的状态
import store from '../../redux/store'
// 引入actionCreator，专门用于创建action对象
import { createIncrementAction, createDecrementAction } from '../../redux/count_action'

export default class Count extends Component {

  state = { carName: '奔驰c63'}

  // componentDidMount () {
  //   // 检测redux中状态的变化，只要变化，就调用render
  //   store.subscribe (() => this.setState({}))
  // }

  // 加法
  increment = () => {
    const { value } = this.selectNumber
    store.dispatch(createIncrementAction(value*1))
  }

  // 减法
  decrement = () => {
    const { value } = this.selectNumber
    store.dispatch(createDecrementAction(value*1))
  }

  // 奇数再加
  incrementIfOdd = () => {
    const { value } = this.selectNumber
    const count = store.getState()
    if (count % 2 !== 0) {
      store.dispatch(createIncrementAction(value*1))
    }
  }

  // 异步加
  incrementAsync = () => {
    const { value } = this.selectNumber
    setTimeout(() => {
      store.dispatch(createIncrementAction(value*1))
    }, 500);
  }

  render() {
    return (
      <div>
				<h1>当前求和为：{store.getState()}</h1>
				<select ref={c => this.selectNumber = c}>
					<option value="1">1</option>
					<option value="2">2</option>
					<option value="3">3</option>
				</select>&nbsp;
				<button onClick={this.increment}>+</button>&nbsp;
				<button onClick={this.decrement}>-</button>&nbsp;
				<button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
				<button onClick={this.incrementAsync}>异步加</button>&nbsp;
			</div>
    )
  }
}
